/****************************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/
/****************************************************************************
 * tools/cmpconfig.c
 *
 *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>

#include "cfgparser.h"

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/****************************************************************************
 * Private Types
 ****************************************************************************/

/****************************************************************************
 * Private Functions
 ****************************************************************************/

static void show_usage(const char *progname)
{
	fprintf(stderr, "USAGE: %s <config1> <config2>\n", progname);
	exit(EXIT_FAILURE);
}

static void compare_variables(struct variable_s *list1, struct variable_s *list2)
{
	char *varval1;
	char *varval2;
	int result;

	while (list1 || list2) {
		if (list1 && list1->val)
			varval1 = list1->val;
		else
			varval1 = "<NULL>";

		if (list2 && list2->val)
			varval2 = list2->val;
		else
			varval2 = "<NULL>";

		if (!list1) {
			printf("file1:\n");
			printf("file2: %s=%s\n\n", list2->var, varval2);
			list2 = list2->flink;
		} else if (!list2) {
			printf("file1: %s=%s\n", list1->var, varval1);
			printf("file2:\n\n");
			list1 = list1->flink;
		} else {
			result = strcmp(list1->var, list2->var);
			if (result < 0) {
				printf("file1: %s=%s\n", list1->var, varval1);
				printf("file2:\n\n");
				list1 = list1->flink;
			} else if (result > 0) {
				printf("file1:\n");
				printf("file2: %s=%s\n\n", list2->var, varval2);
				list2 = list2->flink;
			} else {			/* if (result == 0) */
				result = strcmp(varval1, varval2);
				if (result != 0) {
					printf("file1: %s=%s\n", list1->var, varval1);
					printf("file2: %s=%s\n\n", list2->var, varval2);
				}

				list1 = list1->flink;
				list2 = list2->flink;
			}
		}
	}
}

/****************************************************************************
 * Public Functions
 ****************************************************************************/

int main(int argc, char **argv, char **envp)
{
	struct variable_s *list1 = 0;
	struct variable_s *list2 = 0;
	FILE *stream1;
	FILE *stream2;

	if (argc != 3) {
		fprintf(stderr, "Unexpected number of arguments: %d\n\n", argc);
		show_usage(argv[0]);
	}

	stream1 = fopen(argv[1], "r");
	if (!stream1) {
		fprintf(stderr, "Failed to open %s for reading: %s\n\n", argv[1], strerror(errno));
		show_usage(argv[0]);
	}

	stream2 = fopen(argv[2], "r");
	if (!stream2) {
		fprintf(stderr, "Failed to open %s for reading: %s\n\n", argv[2], strerror(errno));
		show_usage(argv[0]);
	}

	parse_file(stream1, &list1);
	parse_file(stream2, &list2);

	fclose(stream1);
	fclose(stream2);

	printf("Comparing:\n\n");
	printf("  file1 = %s\n", argv[1]);
	printf("  file2 = %s\n\n", argv[2]);
	compare_variables(list1, list2);
	return EXIT_SUCCESS;
}
